How many moles of a gas are in a balloon that has a volume of 15.9L at a pressure of 149kPa and a temperature of 28C?
A sample of carbon dioxide(CO2) has a mass of 55g and occupies 3.3L at 100C. What pressure does the gas exert (in kPa)?
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In both questions we are going to use the ideal gas law PV=nRT
Q1 : So we have n=(PV)/(RT)
P=149 kPa, V=15.9 L, R=8.314 kPa•L/mol•K and T=273+28=301 K
So n=(149*15.9)/(8.314*301)=0.95 moles
Q2 : We have P=(nRT)/V or n=m/M so P=(mRT)/(M*V)
T=273+100= 373 K and M(CO2)=44 g/mol
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